Why don't you employ someone who can speak English?
Really?
Immigrants can't win, can they? We mustn't give them jobs, if their English isn't perfect, but if they don't have jobs, they are benefits tourists.
FWIW, my cleaner of about 10 years is from a country which was not an EU country when she started (but is now). Her English isn't fantastic, but of course she can get by. I imagine she speaks better English than the Spanish spoken by many of the British people who live in Spain.
She is a lovely woman, and an excellent cleaner. We can chat about various things, but sometimes it becomes clear they we are not really understanding each other's nuance.
So, for the OP, she may make a simple request, which may be misunderstood as a criticism. Or she may couch it too softly, and the cleaner may not really understand that she really is not to do the washing in future. And actually, either of these could happen, even if the cleaner were a native English speaker.